effectively
efficient
supereffective
effectatious
effectuously
operative
effectivize
effectivate
where it counts
efficaciously
efficious
availing
potent
good
cooking with gas
efficacy
stroke
effectivity
dynamize
strongly
availableness
impressive
telling
powerfully
trenchantly
efficiently
performantly
potently
perficient
prohedonic
strictly
tune
rigorously
effectuality
effectiveness
effectualness
agree
tenuto
gather strength
cut it
beneficially
effectivization
articulate
in force
lift one's game
efficaciousness
improvable
viability
thoroughly
equieffective
adaptatively
importantly
enter
bounce to the ounce
successfully
deepen
efficacious
effectuousness
for the ages
mitigable
robustly
integratively
systematically
consistently
duratively
reverberate
forcible
benefic
expeditiously
mindfully
add up to
inefficient
operatively
heedfully
crucially
outprocess
wrap around one's little finger
effectually
trick
counteractively
amelioratingly
out-process
vitalise
advertently
rock
enhanceable
refinedly
efficient
supereffective
effectatious
operative
efficious
availing
potent
good
impressive
telling
perficient
prohedonic
improvable
equieffective
efficacious
mitigable
forcible
benefic
inefficient
enhanceable
effectively
effectuously
where it counts
efficaciously
strongly
powerfully
trenchantly
efficiently
performantly
potently
strictly
rigorously
tenuto
beneficially
thoroughly
adaptatively
importantly
successfully
for the ages
robustly
integratively
systematically
consistently
duratively
expeditiously
mindfully
operatively
heedfully
crucially
effectually
counteractively
amelioratingly
advertently
refinedly
efficacy
stroke
effectivity
availableness
effectuality
effectiveness
effectualness
effectivization
efficaciousness
viability
bounce to the ounce
effectuousness
trick
effectivize
effectivate
dynamize
tune
agree
gather strength
cut it
articulate
lift one's game
enter
deepen
reverberate
add up to
outprocess
wrap around one's little finger
out-process
vitalise
rock
English words for 'In an efficient or effective manner; with powerful effect.'
As you may have noticed, above you will find words for "In an efficient or effective manner; with powerful effect.". Hover the mouse over the word you'd like to know more about to view its definition. Click 
to find a better fitting word. Finally, thanks to ChatGPT, the overall results have been greatly improved.
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to be full of
El Dorado
main object
worth doing
to arrange (flowers)
Nevada
nuclear power generation
foppish
palynology
transitory
comb
main idea
JCL
in a resentful manner
security camera
none other than
to ease up
people in the same trade
prim
to work someone hard
TOEFL
to become active.
stagnant water
Christmastide
five
reviewing stand
arena
in the unlikely event that
to be self-important
scientism
Olympic Games
discourtesy
hobo
down time
panting
Wellington boots
moan
erection
privacy
to detest
wholehearted
boarding house
multiple
bud
to compose
intentionally
significant
narrow-minded
slender
prosperity